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# Dynamic Menus

### Requirements

Extension modules sometimes need to modify the menu structure of core modules. For example, a human resources modules may want to add a new submenu "Employees" in the "Users" main menu to show information about this specific kind of user.

### Design

We implement configurable menus similar to views and components by storing all menu information in the database.

    CREATE TABLE im_menus (
            menu_id                 integer
                                    constraint im_menu_id_pk
                                    primary key
                                    constraint im_menu_id_fk
                                    references acs_objects,
                                    -- the name that should appear on the tab
            package_name            varchar(200) not null,
            name                    varchar(200) not null,
            url                     varchar(200) not null,
            sort_order              integer,
                                    -- parent_id allows for tree view for navbars
            parent_menu_id          integer
                                    constraint im_parent_menu_id_fk
                                    references im_menus,
                                    -- Make sure there are no two identical
                                    -- menus on the same _level_.
                                    constraint im_menus_name_un
                                    unique(name, parent_menu_id)
    );